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Evaluation Rubric Reliability and Separation with Iterations While Collapsing Rating Scale Categories.
a Reliability coefficient of variance in rater response that is reproducible (ie, Cronbach's alpha).
b Separation is a coefficient of item standard deviation divided by average measurement error and is an additional reliability coefficient.
c Optimal number of rating scale categories based on the highest reliability (0.98) and separation (7.1) values.
